كتاب الرضاع
30  
Suckling

Yahya related to me from Malik from Thawr ibn Zayd ad-Dili that Abdullah ibn Abbas said, "The milk which a child under two years old sucks, even if it is only one suck, makes the foster relatives haram."

وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ ثَوْرِ بْنِ زَيْدٍ الدِّيلِيِّ، عَنْ عَبْدِ اللَّهِ بْنِ عَبَّاسٍ، أَنَّهُ كَانَ يَقُولُ مَا كَانَ فِي الْحَوْلَيْنِ وَإِنْ كَانَ مَصَّةً وَاحِدَةً فَهُوَ يُحَرِّمُ ‏.‏
Sunnah.com reference : Book 30, Hadith 4
USC-MSA web (English) reference : Book 30, Hadith 4
Arabic reference : Book 30, Hadith 1278